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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69bcb9a25f936ee2d5ea6eacf793b113127bbcecfa4ec1aa16b0dde727809c19' 
  AND token = '0beJlpmM17eCL5T1COw4QG0JP6o/IA/4ujDwPwsmmio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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