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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609b6ca093965784d076305ba5f69bd38b1271116343e2321a4c42c756b3d85d' 
  AND token = '4IhYbyw1ZQqOIMNerfvvlr7sVuqEIMa2oI6feLvLJas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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