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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa659d0a2b61f5bc0cfc9663addedb24c3906f515c997f1b87470d077582ee77' 
  AND token = '+NA8li14XHIdlT98cVacFVI2J4BJ52UImyID4mXy9+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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