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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a774616af54f71d01b77105f8f04006f2395fca8d7439ecc13f45e96fd6b3e' 
  AND token = 'B9M4Sqvw+f0zyv05c7kAtZTZxK+B19qxzCl+/rgPe6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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