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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9d616486b9a4cbd4a96a39b3fa68ea055b6bde21b9ef0966f6e44709962d50' 
  AND token = '1QwHYgBPyJIPG9sBgN5ESU1MdegqCLorEMWy8j7wxTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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