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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c6eda3f83f2f95e778882061adf31609395f766253a9542b3a2b84b554c0ce' 
  AND token = 'QOSmdZ1gPNlzFCFIjFP2Fzz1mlgucuRf2uruwT47Jpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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