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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01d89a9239db36f65b3c864c76e6e9d435daa19d68cf532582438b0785092ea0' 
  AND token = 'r2lBE9bS1l6XOa47ydaLU3RQ+qjwpjDkN2HExocRCMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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