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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f79893880c1722d1fa8897a3314695a06fed822b14113a780ee6b77ebfdf964b' 
  AND token = 'gYwkkm6e+Ga8z5fWvM+JiX99Dp6StpwYHT8Wfv5VWEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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