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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83dafb94117a82121dc527e7201fc77d185a12aba54e4556c786e33e23d5a01e' 
  AND token = '0EY5StLY9CWJU1dCrTchRlLT9Ekwr0YkPDEve/yEoSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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