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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08349907dd7516ca7b2cea66752e145569e3c6c305ba6db5d377e1a88baec7d8' 
  AND token = '5XmyldEuSxiIDKcrmJtt7EQoEG1xL8YtpMHCyxwzgkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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