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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93678c5542bcb6c30d3e3b09d23a314e72d82effb63372b5cd3e83a7ba0a5238' 
  AND token = 'kVDegXXQ8+aLjbbOwf3cd/tw04yibmOjlX1Xtuz8biQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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