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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b87b2a93031582a2eb85fcb97176f3f3c7386bf77e921a945d0d305798571d2' 
  AND token = 'K8n8K5Vnp7q7uf2XGl4ShdDQnpBbu/a27eHK2TEZjak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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