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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b3664510545d96cb0d0b1b74223bc632b3ab58343d8254c576e865736a11ebc' 
  AND token = '4VEWqJWVJGb10NjgyQBVt5MSgM7r3VpRqhqJVFpCe7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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