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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e124bb0cf5e0b9f73bad9f90d83ac29f790f14ba0b74eef6a6bb0b4df9388de4' 
  AND token = 'XlD9tEbdzd9DdM3Ev3pu3uNliF65cEDphG+l13XcH6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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