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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93fd62a0e408b11ddc76ad2ff78b97eaa2ba9cae1b166fe1d66233c81072dfc' 
  AND token = 'dXWx9xG1+pWDrWN0DaB3VFUZ6DlYkQIwOfCqEL+FJy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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