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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6952e430188738469f62bb436cdd8357d4d5579345959b78f35211905edbf08c' 
  AND token = 'hsS3KWTtIt4N4OCtd7q/hMVo010GWMspoFGmvdux+DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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