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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e1642b52cf036daa1f8959ddafacbfd32ee32f532554a1098b8955e12b3bc12' 
  AND token = 'hDeiKn32HQ3IkWB6HMR/UuAPXwBR3QHXQX02L+La//8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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