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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84beefd99f3c7253d369e37c5b2ce39421b43b79614d1bac3f8ed64ea397de08' 
  AND token = 'Vj/qiI2EjzW0scnGoIsHKCxkZhc0M3bAdti9NimmwI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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