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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '586a266cdea4e8a6dfb069a5de9b468de74a07f7cc9f5452aae70e73a9ebc654' 
  AND token = 'KB7zSD1RKTCEKbqSzC3IpgfXWCBbtwW5I+hMdt5ZVEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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