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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea446bee6559c3cc8aecbdf70eb98122049a57a76a2900f4e1a3c5e98c7e1136' 
  AND token = 'o5etAbXW8/fBrJKU9jSpMmD6QHbd4zgiefYknDlsX3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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