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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9714a459189beb2f5258e7e26a9722fc27efb0d2ab0e328f71915f270f010b' 
  AND token = '1iuXSyGY76XzQ2OuVlVd/T1CWpvYrkkoRGOQ2BCX1m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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