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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11dc33b9fd2975d1ba2966298d9808397c703e9dfbe7029a0f87222f8ac362e1' 
  AND token = '3PMwb4mO0ihjAtJ8JdPvTH5OCnZXuavT4OJPqQoT21c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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