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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c90ecc6936c5e6f1e5995ad009de1d84adb44d1bc55c625714e37f82b2245d' 
  AND token = 'MaE5fMtYfqMZf2ZHJh1svv5X9C7nhqhWe8a5R645Ld8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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