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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '772616619b8e803e83ab2f7d1f5e828160b16f333b2f9ff8e667195474c6fc40' 
  AND token = 'wKmFiN8/AUMQCBWJ1irRlKpS1Yo257goY03is71ZALQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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