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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '538331d3cacfbfd8b76f82aa7e8b810bc449800ad21ed65d2160124058f1a3e7' 
  AND token = '7TMCnNZ0l10r5ERhnstgttpg5WLxp2RNPQw71VdGYu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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