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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89bacd4b099e3d7344cf7f3114e9861538e30bf1f9f088e183e7153fd7386035' 
  AND token = 'r5CHMd7WXC9ifBjlJxTLRrG8POHeztMhDtYHYoYvmHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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