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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12b482c62cc9a5c580f80adca7f6fb609a1759f236a26b246510bcce9788c73' 
  AND token = 'bkgGbzEmuRwiqH1d49G9X/MKxicQBW0JPLN32Ip3bic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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