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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c0c96a98ea3cfb4204a795f69ef7bc19fd1cbf17799983a5e091e0bca212e4' 
  AND token = 'I9ftxH1gLJcRyXKTrOETjO93pmHfeZJVrXemawv6TnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00143

JSON explain

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