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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df8639533501ec11491b6f362d873792365de37a8517e1d886e3bde15e90a246' 
  AND token = 'G0AmnwG86QI5fZK3VufOb57szApgOsNPX79l6cIuGh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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