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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da20e15d255f63bf2c1ee6a9fcf57a021867174827374e2f4668658b3c0e6c10' 
  AND token = 'uoHzIB639kECUyz8CQo01ZvcCdNsop95OR7GtUENaDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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