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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c06284f4ae11c522edccb920abf0cf9ec9cc878a9311e3ce082f7a2d4d094d9' 
  AND token = 'JuKHLbBttIbkSde2N/vINlMeR4s2X/K6ob3zwgN5oJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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