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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12fba64e49b2e3e531a0d32107a86d8ea816ebb46f71b325a2c2cd7c5a74a91f' 
  AND token = 'j0F9yby0N+fAL7yc94hlYMlhIf/mcVP1KVYz9+QP/qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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