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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6e4ce385dce9b4ad63c8e4d893f7959a6772d5c9a67f49d45c8cd45a3c4bc43' 
  AND token = '0L69VNThkHeFAdKXqV1vssn+R+xC/l58O1ilMuGzHJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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