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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '316145e498cb2d1586292ec76bb58010b32dbbc4eae56f152f6b888e986ea616' 
  AND token = 'OpOh+h5vH4bmEdr7Hs6zYoUaswcV1/zZ76xi6PRDMLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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