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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b7cc51d55fde7851438a4f92ff3dcc48d62e3e5db6e46a5cbd5ba9bab5efbc' 
  AND token = 'A9V+HVR9CcjAFUrrvhGz1YueXO/I2QF10PcoRD2JwSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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