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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aff82c44d076c56bbd177f1c7811d7b983b2342f64c192c74b64a7ee459d5df' 
  AND token = 'HYcYuto9fRxFPKlLliJecVl3BAKgW0dUT23buYeeKOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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