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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2bc4ab22ef8202e2ed7c55e7e8f328382603461281eeed57a3a320e54cf754' 
  AND token = 'vh8XyImpnJFzgwzIMd2dOp7n0CtPZrpbdme1OicxLKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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