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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f0b62d8b3a36bbdd8aa513e746b41fa050d9a7a6139ef29b2226c4914fa10a' 
  AND token = 'u19sd5vyh09MSO2TTRZn+UcLEn5wk7xPr4arCheRR7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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