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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17028db2c1ab6672d666f4578c61adf908aad3c5b16e013bfc14a9dd56140cd8' 
  AND token = 'OORULSzMT0EmI1sJVWyi+biLv04RvOizjiQPlUYnal8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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