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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c68e108f5414b23701fb7d9cbd911ac2941e5affd37a67bc8164800ec5c320' 
  AND token = 'Wgy2DUxYo6BJuD1iYHgVtCxFQhAsSE2l0/WKpfNQs80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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