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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e315df4c8b31177597e372fb5abdec02bcfdc1b8bbf6d62a093c7ea8932f2217' 
  AND token = '10jFOqrxEqEirxwlk8LMc31HpMwjcZ6s3Zze0XItE+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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