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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472f6f89c0cfc1d8d0ad53a54cc634dad60948265f5748582863bafcf9dda708' 
  AND token = '4pPDLblWaNoBAC4+LKR5TYLp8ZneYqNUb8F2SoFandU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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