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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ffa82b66597bd53de017e86c0244d267e9cdee076bab90cfe4881d0c2f17ed0' 
  AND token = 'clk801r1bRhHNrcWvf4V95OzU6jdFs0dyF9telV5GVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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