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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2a1a61f3bce20bbbf3a87230f7d7ac524251a412cc212d9732570724e2bdbb' 
  AND token = 'c0tVD/wF70Q23EuuIdu8UDt/yiqeTd+gk2j3LmVidaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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