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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c276bd17c424b157e2f8d73dd19ee319c601f96aed41dcc18efa343ee60ebcb' 
  AND token = 'atE5FvJiATJtFTTc9BDKS0uigfNAeWh55tdDS/P9OMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}