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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee8c6b759053712b99f68354efba8b155d3be86832133d36ecc996bcd7e1395' 
  AND token = 'HPlCysDruo68tjMEKSGT/5LeEcUr9CIy1wgs4XAD+d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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