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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63dbde7ab4129c3794ac07bd7a6b5f64b657a1ae90ce5bbd832e2cd0297933a1' 
  AND token = '2RwK6GOfHxJn/dHuBcH6628uF/FQdNJa0f9hQEX+NqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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