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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '164943a907fd9111ed6489d861825ff95a9933ef0f4eee11dca7e09e9e845a5f' 
  AND token = 'fSueGnnoPh0ODHglNczSMlN38fMdhrv61EPl3pq+cUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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