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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45569f691abd89c00f48bc92a5b341710e0db3369f2795d6ad2362a9d9fda7fd' 
  AND token = 'yU+71dUXn+0zeV9SSkSeHh/aAQ/O1nrDOsBZWOw1S/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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