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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e5cce69f6a7964875d01dc7797f5af9824e9d1c5c1ac6e279d1ccb6055feb8' 
  AND token = '2J3HKgJbWVlCAmo8R4a3GWa1tt44EY66i3o/mSkAFlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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