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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '551a1047c8b36a174f379924b3e8494486490421e27f109b1dbe867a7433699a' 
  AND token = 'Lg6SPU7fkGTGww6irbbYoZW290EphfmRCvZ0MlBK6ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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