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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '185fe925f5fd8fd6de480b5f0a754cbf7b8dda0f1b6f1cca36e8427a0e5dbed1' 
  AND token = 'Tql3dl1+wwhhKHg5n53VMCOgGkaMC/VatKvET62rCOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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