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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc99bc3a0de4be0fb79ff7dd9c2d767bc6faf7b28fd43b8b326de659d4093f11' 
  AND token = 'OLjkBz1vUf/4pkUY7Qy68FyoFawGMhFhr9vL7CatvHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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